1: an outer part or edge
2: an ornamental design at the edge of a fabric or rug
3: a narrow bed of planted ground along the edge of a garden or walk (a --- of tulips)
4: boundary (crossed the --- into Italy)
5: a plain or decorative margin around printed matter

Merriam-Webster's
Collegiate Dictionary

The fear o' hell 's a hangman's
whip
To haud the wretch in order;
But where ye feel your honour grip,
Let that aye be your border.